IMO :
Remove the playable alien and concentrate on the AI. Its ridiculous that you can play as one. Aliens aren't meant to be controlled by humans, that takes the immersion totally away and what the Alien franchise is all about. FEAR of the unknown. The Alien isn't some toy to play with. I my opinion this game always was 1 big co-op fest. Sure you can add like a deathmatch between Weyland soldiers and the marines, and maybe add 1 alien with superior IA to hunt both parties.
There are so many co-op variants with the concept/design of "Aliens" thinkable, why did they go the safe way again. (safe way not beeing safe as this is looking like a AVP clone more and more)
"Hu yeah lets make the Aliens playable cous we never seen that before.."
The game doesnt need it. It will not be a COD clone if they only use their brains and just create some fun co-op/dm/tdm modes with humans only playable.
eg :
1. TDM Weyland vs Marines - The Hive : Weyland soldiers must protect the hive from beeing destroyed by the marines, without getting killed themselves by the aliens. And the Queen has just broken free to protect her hive.
2. TDM Weyland vs Marines - Refinery Ship Survival : An unknown refinery craft has picked up on of Weylands cargoholds. An alien has crawled onboard.(yes 1!!!!) Marines are send in to destroy the threat, but weyland wants to take the species alive.
3. Skirmish : just like the old days. Hordes and hordes of aliens. Maybe defend a certain classic location from the movies.
4. 2 player survival : 1 big ship/compound, 1 exit, 1 alien(AI) and 2 marines. 1 has the motiontracker and 1 has the pulserifle. Complete various little tasks to reach the exit.
5. Hive-Raid : 12 played raid with tons of heavy weapons. Destroy everything(skirmish but the other way around)
etc etc ...I can go on for hours.